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• Require that termination power (termpwr) be provided by the SCSI bus
host adapters on each SCSI bus segment.
_____________________ Note _____________________
The UltraSCSI hubs are designed to sense loss of termination
power (such as a cable pull or termpwr not enabled on the
host adapter) and shut down the applicable port to prevent
corrupted signals on the remaining SCSI bus segments.
3.6.1.1 DS-DWZZH-03 Description
The DS-DWZZH-03:
• Is a 3.5-inch StorageWorks building block (SBB).
• Can be installed in:
– A StorageWorks UltraSCSI BA356 storage shelf (which has the
required 180-watt power supply).
– The lower righthand device slot of the BA370 shelf within the RA7000
or ESA 10000 RAID array subsystems. This position minimizes cable
lengths and interference with disks.
– A non-UltraSCSI BA356 which has been upgraded to the 180-watt
power supply with the DS-BA35X-HH option.
• Uses the storage shelf only to provide its power and mechanical support
(it is not connected to the shelf internal SCSI bus).
• Has three Very High Density Cable Interconnect (VHDCI) differential
SCSI bus connectors.
• Does not use a SCSI ID.
• DS-DWZZH-03 and DS-DWZZH-05 UltraSCSI hubs may be housed
in the same storage shelf with disk drives. Table 3–3 provides the
supported configurations.
Figure 3–2 shows a front view of the DS-DWZZH-03 UltraSCSI hub.
Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware 3–9